1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20#include <linux/device.h>
21#include "tpm.h"
22
23struct tpm_readpubek_out {
24 u8 algorithm[4];
25 u8 encscheme[2];
26 u8 sigscheme[2];
27 __be32 paramsize;
28 u8 parameters[12];
29 __be32 keysize;
30 u8 modulus[256];
31 u8 checksum[20];
32} __packed;
33
34#define READ_PUBEK_RESULT_MIN_BODY_SIZE (28 + 256)
35#define TPM_ORD_READPUBEK 124
36
37static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
38 char *buf)
39{
40 struct tpm_buf tpm_buf;
41 struct tpm_readpubek_out *out;
42 ssize_t rc;
43 int i;
44 char *str = buf;
45 struct tpm_chip *chip = to_tpm_chip(dev);
46 char anti_replay[20];
47
48 memset(&anti_replay, 0, sizeof(anti_replay));
49
50 rc = tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK);
51 if (rc)
52 return rc;
53
54 tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay));
55
56 rc = tpm_transmit_cmd(chip, NULL, tpm_buf.data, PAGE_SIZE,
57 READ_PUBEK_RESULT_MIN_BODY_SIZE, 0,
58 "attempting to read the PUBEK");
59 if (rc) {
60 tpm_buf_destroy(&tpm_buf);
61 return 0;
62 }
63
64 out = (struct tpm_readpubek_out *)&tpm_buf.data[10];
65 str +=
66 sprintf(str,
67 "Algorithm: %02X %02X %02X %02X\n"
68 "Encscheme: %02X %02X\n"
69 "Sigscheme: %02X %02X\n"
70 "Parameters: %02X %02X %02X %02X "
71 "%02X %02X %02X %02X "
72 "%02X %02X %02X %02X\n"
73 "Modulus length: %d\n"
74 "Modulus:\n",
75 out->algorithm[0], out->algorithm[1], out->algorithm[2],
76 out->algorithm[3],
77 out->encscheme[0], out->encscheme[1],
78 out->sigscheme[0], out->sigscheme[1],
79 out->parameters[0], out->parameters[1],
80 out->parameters[2], out->parameters[3],
81 out->parameters[4], out->parameters[5],
82 out->parameters[6], out->parameters[7],
83 out->parameters[8], out->parameters[9],
84 out->parameters[10], out->parameters[11],
85 be32_to_cpu(out->keysize));
86
87 for (i = 0; i < 256; i++) {
88 str += sprintf(str, "%02X ", out->modulus[i]);
89 if ((i + 1) % 16 == 0)
90 str += sprintf(str, "\n");
91 }
92
93 rc = str - buf;
94 tpm_buf_destroy(&tpm_buf);
95 return rc;
96}
97static DEVICE_ATTR_RO(pubek);
98
99static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,
100 char *buf)
101{
102 cap_t cap;
103 u8 digest[TPM_DIGEST_SIZE];
104 ssize_t rc;
105 int i, j, num_pcrs;
106 char *str = buf;
107 struct tpm_chip *chip = to_tpm_chip(dev);
108
109 rc = tpm_getcap(chip, TPM_CAP_PROP_PCR, &cap,
110 "attempting to determine the number of PCRS",
111 sizeof(cap.num_pcrs));
112 if (rc)
113 return 0;
114
115 num_pcrs = be32_to_cpu(cap.num_pcrs);
116 for (i = 0; i < num_pcrs; i++) {
117 rc = tpm_pcr_read_dev(chip, i, digest);
118 if (rc)
119 break;
120 str += sprintf(str, "PCR-%02d: ", i);
121 for (j = 0; j < TPM_DIGEST_SIZE; j++)
122 str += sprintf(str, "%02X ", digest[j]);
123 str += sprintf(str, "\n");
124 }
125 return str - buf;
126}
127static DEVICE_ATTR_RO(pcrs);
128
129static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
130 char *buf)
131{
132 cap_t cap;
133 ssize_t rc;
134
135 rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
136 "attempting to determine the permanent enabled state",
137 sizeof(cap.perm_flags));
138 if (rc)
139 return 0;
140
141 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
142 return rc;
143}
144static DEVICE_ATTR_RO(enabled);
145
146static ssize_t active_show(struct device *dev, struct device_attribute *attr,
147 char *buf)
148{
149 cap_t cap;
150 ssize_t rc;
151
152 rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
153 "attempting to determine the permanent active state",
154 sizeof(cap.perm_flags));
155 if (rc)
156 return 0;
157
158 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
159 return rc;
160}
161static DEVICE_ATTR_RO(active);
162
163static ssize_t owned_show(struct device *dev, struct device_attribute *attr,
164 char *buf)
165{
166 cap_t cap;
167 ssize_t rc;
168
169 rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
170 "attempting to determine the owner state",
171 sizeof(cap.owned));
172 if (rc)
173 return 0;
174
175 rc = sprintf(buf, "%d\n", cap.owned);
176 return rc;
177}
178static DEVICE_ATTR_RO(owned);
179
180static ssize_t temp_deactivated_show(struct device *dev,
181 struct device_attribute *attr, char *buf)
182{
183 cap_t cap;
184 ssize_t rc;
185
186 rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
187 "attempting to determine the temporary state",
188 sizeof(cap.stclear_flags));
189 if (rc)
190 return 0;
191
192 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
193 return rc;
194}
195static DEVICE_ATTR_RO(temp_deactivated);
196
197static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
198 char *buf)
199{
200 struct tpm_chip *chip = to_tpm_chip(dev);
201 cap_t cap;
202 ssize_t rc;
203 char *str = buf;
204
205 rc = tpm_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
206 "attempting to determine the manufacturer",
207 sizeof(cap.manufacturer_id));
208 if (rc)
209 return 0;
210 str += sprintf(str, "Manufacturer: 0x%x\n",
211 be32_to_cpu(cap.manufacturer_id));
212
213
214 rc = tpm_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
215 "attempting to determine the 1.2 version",
216 sizeof(cap.tpm_version_1_2));
217 if (!rc) {
218 str += sprintf(str,
219 "TCG version: %d.%d\nFirmware version: %d.%d\n",
220 cap.tpm_version_1_2.Major,
221 cap.tpm_version_1_2.Minor,
222 cap.tpm_version_1_2.revMajor,
223 cap.tpm_version_1_2.revMinor);
224 } else {
225
226 rc = tpm_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
227 "attempting to determine the 1.1 version",
228 sizeof(cap.tpm_version));
229 if (rc)
230 return 0;
231 str += sprintf(str,
232 "TCG version: %d.%d\nFirmware version: %d.%d\n",
233 cap.tpm_version.Major,
234 cap.tpm_version.Minor,
235 cap.tpm_version.revMajor,
236 cap.tpm_version.revMinor);
237 }
238
239 return str - buf;
240}
241static DEVICE_ATTR_RO(caps);
242
243static ssize_t cancel_store(struct device *dev, struct device_attribute *attr,
244 const char *buf, size_t count)
245{
246 struct tpm_chip *chip = to_tpm_chip(dev);
247 if (chip == NULL)
248 return 0;
249
250 chip->ops->cancel(chip);
251 return count;
252}
253static DEVICE_ATTR_WO(cancel);
254
255static ssize_t durations_show(struct device *dev, struct device_attribute *attr,
256 char *buf)
257{
258 struct tpm_chip *chip = to_tpm_chip(dev);
259
260 if (chip->duration[TPM_LONG] == 0)
261 return 0;
262
263 return sprintf(buf, "%d %d %d [%s]\n",
264 jiffies_to_usecs(chip->duration[TPM_SHORT]),
265 jiffies_to_usecs(chip->duration[TPM_MEDIUM]),
266 jiffies_to_usecs(chip->duration[TPM_LONG]),
267 chip->duration_adjusted
268 ? "adjusted" : "original");
269}
270static DEVICE_ATTR_RO(durations);
271
272static ssize_t timeouts_show(struct device *dev, struct device_attribute *attr,
273 char *buf)
274{
275 struct tpm_chip *chip = to_tpm_chip(dev);
276
277 return sprintf(buf, "%d %d %d %d [%s]\n",
278 jiffies_to_usecs(chip->timeout_a),
279 jiffies_to_usecs(chip->timeout_b),
280 jiffies_to_usecs(chip->timeout_c),
281 jiffies_to_usecs(chip->timeout_d),
282 chip->timeout_adjusted
283 ? "adjusted" : "original");
284}
285static DEVICE_ATTR_RO(timeouts);
286
287static struct attribute *tpm_dev_attrs[] = {
288 &dev_attr_pubek.attr,
289 &dev_attr_pcrs.attr,
290 &dev_attr_enabled.attr,
291 &dev_attr_active.attr,
292 &dev_attr_owned.attr,
293 &dev_attr_temp_deactivated.attr,
294 &dev_attr_caps.attr,
295 &dev_attr_cancel.attr,
296 &dev_attr_durations.attr,
297 &dev_attr_timeouts.attr,
298 NULL,
299};
300
301static const struct attribute_group tpm_dev_group = {
302 .attrs = tpm_dev_attrs,
303};
304
305void tpm_sysfs_add_device(struct tpm_chip *chip)
306{
307
308
309
310 if (chip->flags & TPM_CHIP_FLAG_TPM2)
311 return;
312
313
314
315
316
317 WARN_ON(chip->groups_cnt != 0);
318 chip->groups[chip->groups_cnt++] = &tpm_dev_group;
319}
320
